1 | /* |
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2 | * Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <info@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <bsp/arm-pl011.h> |
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16 | |
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17 | static volatile pl011 *pl011_get_regs(rtems_termios_device_context *base) |
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18 | { |
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19 | arm_pl011_context *ctx = (arm_pl011_context *) base; |
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20 | |
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21 | return ctx->regs; |
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22 | } |
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23 | |
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24 | |
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25 | bool arm_pl011_probe(rtems_termios_device_context *base) |
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26 | { |
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27 | volatile pl011 *regs = pl011_get_regs(base); |
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28 | |
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29 | regs->uartlcr_h = PL011_UARTLCR_H_WLEN(PL011_UARTLCR_H_WLEN_8); |
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30 | regs->uartcr = PL011_UARTCR_RXE |
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31 | | PL011_UARTCR_TXE |
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32 | | PL011_UARTCR_UARTEN; |
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33 | |
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34 | return true; |
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35 | } |
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36 | |
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37 | static bool pl011_first_open( |
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38 | struct rtems_termios_tty *tty, |
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39 | rtems_termios_device_context *base, |
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40 | struct termios *term, |
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41 | rtems_libio_open_close_args_t *args |
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42 | ) |
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43 | { |
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44 | arm_pl011_context *ctx = (arm_pl011_context *) base; |
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45 | |
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46 | rtems_termios_set_initial_baud(tty, ctx->initial_baud); |
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47 | |
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48 | return true; |
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49 | } |
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50 | |
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51 | static int pl011_read_polled(rtems_termios_device_context *base) |
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52 | { |
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53 | volatile pl011 *regs = pl011_get_regs(base); |
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54 | |
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55 | if ((regs->uartfr & PL011_UARTFR_RXFE) != 0) { |
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56 | return -1; |
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57 | } else { |
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58 | return PL011_UARTDR_DATA_GET(regs->uartdr); |
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59 | } |
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60 | } |
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61 | |
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62 | void arm_pl011_write_polled(rtems_termios_device_context *base, char c) |
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63 | { |
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64 | volatile pl011 *regs = pl011_get_regs(base); |
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65 | |
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66 | while ((regs->uartfr & PL011_UARTFR_TXFF) != 0) { |
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67 | /* Wait */ |
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68 | } |
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69 | |
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70 | regs->uartdr = PL011_UARTDR_DATA(c); |
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71 | } |
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72 | |
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73 | static void pl011_write_support_polled( |
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74 | rtems_termios_device_context *base, |
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75 | const char *s, |
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76 | size_t n |
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77 | ) |
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78 | { |
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79 | size_t i; |
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80 | |
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81 | for (i = 0; i < n; ++i) { |
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82 | arm_pl011_write_polled(base, s[i]); |
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83 | } |
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84 | } |
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85 | |
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86 | const rtems_termios_device_handler arm_pl011_fns = { |
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87 | .first_open = pl011_first_open, |
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88 | .poll_read = pl011_read_polled, |
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89 | .write = pl011_write_support_polled, |
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90 | .mode = TERMIOS_POLLED |
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91 | }; |
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